multi layer pcb circuit board 1.high precision 2.FR-4 base material 3.gold ... ,,FR-2,CEM-1,CEM-3 Board Cutting Max. number of layers 8 Min. thickness for inner layers (Cu thickness are excluded ... pb free,immersion gold,immersion silver,immersion tin,O.S.P (Entek),S/G plating,ENEPIG,G/F plating,carbon… Gold Finger ... ° 45° 60° Others UL Cert. YISO Cert.ISO9001TS16949YISO14000Y multilayer pcb circuit board